一. 方式

 1.注册监听

//注册监听耳机设备的插入/拔出

    AudioSessionAddPropertyListener (kAudioSessionProperty_AudioRouteChange,audioRouteChangeListenerCallback,  nil);

2.

^{void audioRouteChangeListenerCallback (}

^{void                      *inUserData,}

^{AudioSessionPropertyID    inPropertyID,}

^{UInt32                    inPropertyValueSize,}

^{const void                *inPropertyValue}

                                       ^{) {}

^{if (inPropertyID != kAudioSessionProperty_AudioRouteChange) return;}

^{CFDictionaryRef routeChangeDictionary = (CFDictionaryRef)inPropertyValue;}

^{CFNumberRef routeChangeReasonRef =}

    ^{(CFNumberRef)CFDictionaryGetValue (routeChangeDictionary,}

                          ^{CFSTR (kAudioSession_AudioRouteChangeKey_Reason));}

^{SInt32 routeChangeReason;}

^{CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason);}

^{if (routeChangeReason == kAudioSessionRouteChangeReason_OldDeviceUnavailable) {}

^{NSLog(@"拔掉耳机");}

    ^{} elseif (routeChangeReason == kAudioSessionRouteChangeReason_NewDeviceAvailable) {}

^{NSLog(@"插入耳机");}

    ^{} elseif (routeChangeReason == kAudioSessionRouteChangeReason_NoSuitableRouteForCategory) {}

    ^}

^}

二 . 

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(outputDeviceChanged:) name:AVAudioSessionRouteChangeNotification object:[AVAudioSession sharedInstance]];

 

- (void)outputDeviceChanged:(NSNotification *)aNotification

{

    BOOL flag = [AudioHelper hasHeadset];

    if (flag) {

        [MBProgressHUD showMessageHUDAddedTo:self.view message:@"设备已插入"];

    }

    else

    {

        [MBProgressHUD showMessageHUDAddedTo:self.view message:@"设备已拔出"];

    }

}